freebsd-dev/sys/nfsclient/nfs_diskless.c
Bjoern A. Zeeb 4b79449e2f Rather than using hidden includes (with cicular dependencies),
directly include only the header files needed. This reduces the
unneeded spamming of various headers into lots of files.

For now, this leaves us with very few modules including vnet.h
and thus needing to depend on opt_route.h.

Reviewed by:	brooks, gnn, des, zec, imp
Sponsored by:	The FreeBSD Foundation
2008-12-02 21:37:28 +00:00

342 lines
9.2 KiB
C

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_bootp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/vimage.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/ethernet.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <rpc/rpcclnt.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsdiskless.h>
static int inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa);
static int hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa);
static int decode_nfshandle(char *ev, u_char *fh);
/*
* Validate/sanity check a rsize/wsize parameter.
*/
static int
checkrwsize(unsigned long v, const char *name)
{
/*
* 32K is used as an upper bound because most servers
* limit block size to satisfy IPv4's limit of
* 64K/reassembled packet. The lower bound is pretty
* much arbitrary.
*/
if (!(4 <= v && v <= 32*1024)) {
printf("nfs_parse_options: invalid %s %lu ignored\n", name, v);
return 0;
} else
return 1;
}
/*
* Parse mount options and apply them to the supplied
* nfs_diskless state. Used also by bootp/dhcp support.
*/
void
nfs_parse_options(const char *envopts, struct nfs_args *nd)
{
char *opts, *o, *otmp;
unsigned long v;
opts = strdup(envopts, M_TEMP);
otmp = opts;
while ((o = strsep(&otmp, ":;, ")) != NULL) {
if (*o == '\0')
; /* Skip empty options. */
else if (strcmp(o, "soft") == 0)
nd->flags |= NFSMNT_SOFT;
else if (strcmp(o, "intr") == 0)
nd->flags |= NFSMNT_INT;
else if (strcmp(o, "conn") == 0)
nd->flags |= NFSMNT_NOCONN;
else if (strcmp(o, "nolockd") == 0)
nd->flags |= NFSMNT_NOLOCKD;
else if (strcmp(o, "nfsv2") == 0)
nd->flags &= ~(NFSMNT_NFSV3 | NFSMNT_NFSV4);
else if (strcmp(o, "nfsv3") == 0) {
nd->flags &= ~NFSMNT_NFSV4;
nd->flags |= NFSMNT_NFSV3;
} else if (strcmp(o, "tcp") == 0)
nd->sotype = SOCK_STREAM;
else if (strcmp(o, "udp") == 0)
nd->sotype = SOCK_DGRAM;
else if (strncmp(o, "rsize=", 6) == 0) {
v = strtoul(o+6, NULL, 10);
if (checkrwsize(v, "rsize")) {
nd->rsize = (int) v;
nd->flags |= NFSMNT_RSIZE;
}
} else if (strncmp(o, "wsize=", 6) == 0) {
v = strtoul(o+6, NULL, 10);
if (checkrwsize(v, "wsize")) {
nd->wsize = (int) v;
nd->flags |= NFSMNT_WSIZE;
}
} else
printf("%s: skipping unknown option \"%s\"\n",
__func__, o);
}
free(opts, M_TEMP);
}
/*
* Populate the essential fields in the nfsv3_diskless structure.
*
* The loader is expected to export the following environment variables:
*
* boot.netif.name name of boot interface
* boot.netif.ip IP address on boot interface
* boot.netif.netmask netmask on boot interface
* boot.netif.gateway default gateway (optional)
* boot.netif.hwaddr hardware address of boot interface
* boot.nfsroot.server IP address of root filesystem server
* boot.nfsroot.path path of the root filesystem on server
* boot.nfsroot.nfshandle NFS handle for root filesystem on server
* boot.nfsroot.options NFS options for the root filesystem
*/
void
nfs_setup_diskless(void)
{
INIT_VNET_NET(curvnet);
struct nfs_diskless *nd = &nfs_diskless;
struct ifnet *ifp;
struct ifaddr *ifa;
struct sockaddr_dl *sdl, ourdl;
struct sockaddr_in myaddr, netmask;
char *cp;
if (nfs_diskless_valid)
return;
/* set up interface */
if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
return;
if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
printf("nfs_diskless: no netmask\n");
return;
}
bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
printf("nfs_diskless: no hardware address\n");
return;
}
ifa = NULL;
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family == AF_LINK) {
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if ((sdl->sdl_type == ourdl.sdl_type) &&
(sdl->sdl_alen == ourdl.sdl_alen) &&
!bcmp(LLADDR(sdl),
LLADDR(&ourdl),
sdl->sdl_alen)) {
IFNET_RUNLOCK();
goto match_done;
}
}
}
}
IFNET_RUNLOCK();
printf("nfs_diskless: no interface\n");
return; /* no matching interface */
match_done:
setenv("boot.netif.name", ifp->if_xname);
strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
/* set up gateway */
inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
/* set up root mount */
nd->root_args.rsize = 8192; /* XXX tunable? */
nd->root_args.wsize = 8192;
nd->root_args.sotype = SOCK_STREAM;
nd->root_args.flags = (NFSMNT_NFSV3 | NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT);
if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
printf("nfs_diskless: no server\n");
return;
}
nd->root_saddr.sin_port = htons(NFS_PORT);
if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
printf("nfs_diskless: no NFS handle\n");
return;
}
if ((cp = getenv("boot.nfsroot.path")) != NULL) {
strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
freeenv(cp);
}
if ((cp = getenv("boot.nfsroot.options")) != NULL) {
struct nfs_args args;
/* XXX yech, convert between old and current arg format */
args.flags = nd->root_args.flags;
args.sotype = nd->root_args.sotype;
args.rsize = nd->root_args.rsize;
args.wsize = nd->root_args.wsize;
nfs_parse_options(cp, &args);
nd->root_args.flags = args.flags;
nd->root_args.sotype = args.sotype;
nd->root_args.rsize = args.rsize;
nd->root_args.wsize = args.wsize;
freeenv(cp);
}
nfs_diskless_valid = 1;
}
static int
inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
{
u_int32_t a[4];
char *cp;
int count;
bzero(sa, sizeof(*sa));
sa->sin_len = sizeof(*sa);
sa->sin_family = AF_INET;
if ((cp = getenv(ev)) == NULL)
return (1);
count = sscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]);
freeenv(cp);
if (count != 4)
return (1);
sa->sin_addr.s_addr =
htonl((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3]);
return (0);
}
static int
hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
{
char *cp;
u_int32_t a[6];
int count;
bzero(sa, sizeof(*sa));
sa->sdl_len = sizeof(*sa);
sa->sdl_family = AF_LINK;
sa->sdl_type = IFT_ETHER;
sa->sdl_alen = ETHER_ADDR_LEN;
if ((cp = getenv(ev)) == NULL)
return (1);
count = sscanf(cp, "%x:%x:%x:%x:%x:%x",
&a[0], &a[1], &a[2], &a[3], &a[4], &a[5]);
freeenv(cp);
if (count != 6)
return (1);
sa->sdl_data[0] = a[0];
sa->sdl_data[1] = a[1];
sa->sdl_data[2] = a[2];
sa->sdl_data[3] = a[3];
sa->sdl_data[4] = a[4];
sa->sdl_data[5] = a[5];
return (0);
}
static int
decode_nfshandle(char *ev, u_char *fh)
{
u_char *cp, *ep;
int len, val;
ep = cp = getenv(ev);
if (cp == NULL)
return (0);
if ((strlen(cp) < 2) || (*cp != 'X')) {
freeenv(ep);
return (0);
}
len = 0;
cp++;
for (;;) {
if (*cp == 'X') {
freeenv(ep);
return (len);
}
if ((sscanf(cp, "%2x", &val) != 1) || (val > 0xff)) {
freeenv(ep);
return (0);
}
*(fh++) = val;
len++;
cp += 2;
if (len > NFSX_V2FH) {
freeenv(ep);
return (0);
}
}
}
#if !defined(BOOTP_NFSROOT)
static void
nfs_rootconf(void)
{
nfs_setup_diskless();
if (nfs_diskless_valid)
rootdevnames[0] = "nfs:";
}
SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, nfs_rootconf, NULL);
#endif